ETSI ETS 300 976-1997 数字蜂窝通信系统(第2+代);公共陆地移动网(PLMN)和综合业务数字网(ISDN)或公共交换电话网(PSTN)互通的一般要求(第2版GSM0)
Digital Cellular Telecommunications System (Phase 2+); General Requirements on Interworking Between the Public Land Mobile Network (PLMN) and the Integrated Services Digital Network (ISDN) or Public Switched Telephone Network (PSTN) (GSM 09.07 Version 5.2